cciss: fix scatter gather chain block dma direction kludge

cciss: fix scatter gather chain block dma direction kludge
The data direction for the chained block of scatter gather
elements should always be PCI_DMA_TODEVICE, but was mistakenly
set to the direction of the data transfer, then a kludge to
fix it was added, in which pci_dma_sync_single_for_device or
pci_dma_sync_single_for_cpu was called.  If the correct direction
is used in the first place, the kludge isn't needed.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index adc517c..c0d794c 100644 (file)
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -1717,10 +1717,8 @@ static void cciss_softirq_done(struct request *rq)
                if (curr_sg[sg_index].Ext == CCISS_SG_CHAIN) {
                        temp64.val32.lower = cmd->SG[i].Addr.lower;
                        temp64.val32.upper = cmd->SG[i].Addr.upper;
-                       pci_dma_sync_single_for_cpu(h->pdev, temp64.val,
-                                               cmd->SG[i].Len, ddir);
                        pci_unmap_single(h->pdev, temp64.val,
-                                               cmd->SG[i].Len, ddir);
+                               cmd->SG[i].Len, PCI_DMA_TODEVICE);
                        /* Point to the next block */
                        curr_sg = h->cmd_sg_list[cmd->cmdindex];
                        sg_index = 0;
@@ -3223,11 +3221,11 @@ static void do_cciss_request(struct request_queue *q)
                 * block with address of next chain block.
                 */
                temp64.val = pci_map_single(h->pdev,
-                                       h->cmd_sg_list[c->cmdindex], len, dir);
+                                       h->cmd_sg_list[c->cmdindex], len,
+                                       PCI_DMA_TODEVICE);
                dma_addr = temp64.val;
                curr_sg[sg_index].Addr.lower = temp64.val32.lower;
                curr_sg[sg_index].Addr.upper = temp64.val32.upper;
-               pci_dma_sync_single_for_device(h->pdev, dma_addr, len, dir);
        }
 
        /* track how many SG entries we are using */